/**
 * 
 */
package org.hotpotmaterial.codegenn2.utils;

import java.util.Base64;

import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;

import lombok.extern.slf4j.Slf4j;

/**
 * @author cakydeveloper
 *
 */
@Slf4j
public class AESUtil {
	
	private static final String KEY_ALGORITHM = "AES";
    private static final String DEFAULT_CIPHER_ALGORITHM = "AES/ECB/PKCS5Padding";//默认的加密算法
    
    private static final Base64.Decoder decoder = Base64.getDecoder();
    private static final Base64.Encoder encoder = Base64.getEncoder();
    
    /**
     * AES 加密操作
     *
     * @param content 待加密内容
     * @param key 加密密钥
     * @return 返回Base64转码后的加密数据
     */
    public static String encrypt(String content, String key) {
        try {
            Cipher cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM);// 创建密码器
            byte[] byteContent = content.getBytes("utf-8");
            cipher.init(Cipher.ENCRYPT_MODE, getSecretKey(key));// 初始化为加密模式的密码器
            byte[] result = cipher.doFinal(byteContent);// 加密
            
            return encoder.encodeToString(result);//通过Base64转码返回
            
        } catch (Exception ex) {
            log.error("AES encrypting failed!!!", ex);
        }
    
        return null;
    }
    
    /**
     * AES 解密操作
     *
     * @param content
     * @param key
     * @return
     */
    public static String decrypt(String content, String key) {
    
        try {
            //实例化
            Cipher cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM);   
            //使用密钥初始化，设置为解密模式
            cipher.init(Cipher.DECRYPT_MODE, getSecretKey(key));   
            //执行操作
            byte[] result = cipher.doFinal(decoder.decode(content));
    
            return new String(result, "utf-8");
        } catch (Exception ex) {
        	log.error("AES decrypting failed!!!", ex);
        }
    
        return null;
    }
    
    /**
     * 生成加密秘钥
     *
     * @return
     */
    private static SecretKeySpec getSecretKey(final String key) {
    	return new SecretKeySpec(key.getBytes(), KEY_ALGORITHM);
    }

}
